getRootBoxModel method
Get the root box model of document which corresponds to html element.
Implementation
RenderBoxModel? getRootBoxModel() {
RenderBoxModel _self = this;
while (_self.parent != null && _self.parent is! RenderViewportBox) {
_self = _self.parent as RenderBoxModel;
}
return _self.parent is RenderViewportBox ? _self : null;
}